Patent application number | Description | Published |
20090245089 | BIT-WIDTH MINIMIZATION SCHEME FOR WIRELESS COMMUNICATION - A technique for generating a reduced bit-width in a signal generated by a first-type modulator in a communication apparatus that includes two distinct modulators. In particular, the communication apparatus includes a first modulator adapted to generate a first modulated signal quantified to a first bit-width, a second modulator adapted to generate a second modulated signal quantified to a second bit-width that is less than the first bit-width, and a device to generate a third modulated signal comprising a combination of the first and second modulated signals. In an exemplary implementation, the first modulator includes an OFDMA modulator, the second modulator includes a CDMA, and the combining device includes an IFFT. Additionally, an apparatus for processing a communication signal includes a tasklist cache memory having a tasklist, a processor adapted to provide a task to the tasklist, and a communication module adapted to fetch the task from the tasklist, and process the communication signal based on the retrieved task. | 10-01-2009 |
20090245222 | RETURN LINK TIME ADJUSTMENTS IN FDD OFDMA OR SC-FDM SYSTEMS - A method for adjusting timing in a Frequency Division Multiplexing (FDM) system, including receiving a request to perform a timing correction, generating a time domain FDM symbol, and controlling the timing correction in the time domain FDM symbol by at least one of adjusting a length of a cyclic prefix, overlapping a portion of adjacent FDM symbols, adjusting a symbol windowing length, or utilizing a return link (RL) silence interval. | 10-01-2009 |
20090245433 | Systems and Methods for Approximating Log Likelihood Ratios in a Communication System - Systems and methods for computing log likelihood ratios in a communication system are described. A demodulated symbol may be received. A set of scalars may be determined based on a modulation order, a signal-to-noise ratio for the symbol, and a bit of the symbol. At least one log likelihood ratio for the bit may be approximated using a piecewise linear process based on the scalars and the symbol. | 10-01-2009 |
20090268603 | MULTIPLE STAGE FOURIER TRANSFORM APPARATUS, PROCESSES, AND ARTICLES OF MANUFACTURE - In embodiments, a fast Fourier transform (FFT) engine includes a series of stages, each stage containing a butterfly and a data normalization device configured to scale output of the stage's butterfly. The scaling factors are adjusted, for example, periodically or on as-needed basis, so that the dynamic range of the butterflies and the buffers is increased for a given bit-width, or the bit-width of these devices is decreased for the same dynamic range. Additionally, bit-width of other buffer(s) is decreased because of the scaling of the data. | 10-29-2009 |
20100046357 | USING CDMA TO SEND UPLINK SIGNALS IN WLANs - Methods and apparatus for using code-division multiple access (CDMA) via orthogonal frequency-division multiplexing (OFDM) to convey information from user terminals to an access point (AP) in a wireless local area network (WLAN), for example, are provided. Employed in an effort to support a large number of user terminals while avoiding collisions, this CDMA-based scheme may offer a number of advantages when compared to conventional techniques for transmitting UL signals from a large number of user terminals. First, efficiency with respect to the number of slots used may be increased. In addition, this scheme may be scalable to a high number of user terminals and may have a soft limit as to the number of users that can be supported. Furthermore, this CDMA-based scheme may offer greater tolerance to frequency offsets and may be utilized for ranging and power control. | 02-25-2010 |
20100046367 | POWER AND RESOURCE EFFICIENT APPDU BASED APPROACH WITH SCHEDULED DATA TRANSMISSION TIMES FOR WLAN - Disclosed are methods and apparatuses for communications by which a physical layer packet is generated for transmission to a node, or by which a physical layer packet is received from a node, the physical layer packet having a plurality of MAC packets, wherein the physical layer packet includes a transmission schedule associated with the plurality of MAC packets in the physical layer packet. | 02-25-2010 |
20100046441 | POWER AND RESOURCE EFFICIENT APPDU BASED APPROACH WITH SCHEDULED BLOCK ACKS FOR WLAN - Disclosed are methods and apparatuses for communications by which a data packet is generated for transmission to a node, or by which a data packet is received from a node, the data packet including a header and data, wherein a channel designation for a node to send an acknowledgement to an apparatus or a transmitting node is embedded in the header of the data packet. | 02-25-2010 |
20100046457 | METHODS AND APPARATUS FOR SCHEDULING WIRELESS TRANSMISSIONS - Certain embodiments provide a method for scheduling packet transmissions in a wireless communications with stations that support spatial division multiple access (SDMA) transmissions. The method generally includes receiving channel state training signals from a plurality of wireless network nodes, constructing a schedule for uplink and downlink packet transmissions for the nodes based on the channel state training signals, and communicating the schedule to the nodes. | 02-25-2010 |
20100046491 | METHOD FOR RANGING DEVICES USING CODE SEQUENCES IN WLANs - Methods and apparatus for using code-division multiple access (CDMA) to transmit information via orthogonal frequency-division multiplexing (OFDM) to convey information from user terminals to an access point (AP) in a wireless local area network (WLAN) are provided. By using CDMA to convey information, a propagation delay between an access point (AP) and a user terminal may be determined by the AP, and timing adjustment information based on the delay may be sent to the user terminal. In this manner, subsequent uplink (UL) transmissions from multiple user terminals may be received simultaneously by the AP, despite the multiple user terminals having potentially different propagation delays. | 02-25-2010 |
20100046492 | METHOD AND APPARATUS TO PERFORM RANGING OPERATIONS FOR WIRELESS STATIONS - Certain embodiments provide methods and apparatus for adjusting timing in an SDMA system. One method for adjusting the timing of packet transmissions in a wireless communications system, that may be performed by an access point, includes receiving ranging signals from a plurality of wireless network nodes, determining timing adjustment information for adjusting starting timing of packet transmissions from the wireless network nodes based on the ranging signals, and communicating the timing adjustment information to the wireless network nodes. | 02-25-2010 |
20100220601 | METHOD AND APPARATUS FOR SCHEDULING TRANSMISSIONS IN SPATIAL DIVISION MULTIPLE ACCESS NETWORK SYSTEMS - An apparatus for communications including a processing system configured to generate a plurality of spatial streams for communicating with a plurality of nodes, the processing system being further capable of determining an allocation of the spatial streams to each of the nodes based on at least one metric for each of the nodes. | 09-02-2010 |
20100220813 | PROTOCOL OPERATION AND MESSAGE DESIGN FOR SDMA DATA TRANSMISSION TO A PLURALITY OF STATIONS - An apparatus including a processing system configured to construct a coding matrix from channel state information and encode a plurality of spatial streams with the coding matrix for transmission to one or more nodes. A method for performing the process is also disclosed herein. | 09-02-2010 |
20100232352 | PRECODING TECHNIQUE FOR MULTIUSER MIMO BASED ON EIGENMODE SELECTION AND MMSE - The present disclosure proposes a method for preceding of a transmission signal at an access point of a multiuser system based on eigenmode selection and minimum mean square error (MMSE) processing. The most reliable eigenmodes of every multiple-input multiple-output (MIMO) channel in the system can be selected at each user terminal and corresponding eigenvalues and eigenvectors can be fed back to the access point. The linear MMSE precoding (beamforming) applied at the access point based on the selected eigenmodes may provide an improved transmission capacity performance compare to techniques from the prior art. | 09-16-2010 |
20100238912 | SIGNALING METHODS FOR MMSE PRECODING WITH EIGENMODE SELECTION - Different methods of signaling between an access point and user terminals in a multiuser wireless system for performing a minimum mean square error (MMSE) precoding at the access point preceded with eigenmode selection are provided. For one embodiment of the present disclosure, a compact feedback may be utilized between a plurality of user terminals and the access point. For another embodiment of the present disclosure, a hybrid feedback may be utilized between the plurality of user terminals and the access point. For yet another embodiment of the present disclosure, a full feedback may be utilized between the plurality of user terminals and the access point. | 09-23-2010 |
20100260060 | INTEGRATED CALIBRATION PROTOCOL FOR WIRELESS LANS - Certain aspects of the present disclosure provide a protocol for calibration of an access point in a wireless network. | 10-14-2010 |
20100260114 | ACKNOWLEDGEMENT RESOURCE ALLOCATION AND SCHEDULING FOR WLANS - Disclosed are methods and apparatuses for communication by which a physical layer packet is generated for transmission to a plurality of nodes, or by which a physical layer packet is received by a plurality of nodes, wherein a resource allocation for each of the plurality of nodes to send an acknowledgement to an apparatus or a transmitting node is included in the physical layer packet. | 10-14-2010 |
20100284312 | SYNCHRONIOUS MULTI-CHANNEL TRANSMISSIONS IN WIRELESS LOCAL AREA NETWORKS - Certain aspects of the present disclosure relate to a method for synchronous multi-channel transmissions in wireless local area networks. An access point can change allocation of its transmit and receive chains across multiple frequency bands ensuring that both uplink and downlink transmissions are properly performed for each station in a wireless system | 11-11-2010 |
20100284393 | ENHANCED MULTICHANNEL ACCESS FOR VERY HIGH THROUGHPUT - Certain aspects of the present disclosure relate to a method for enhanced multichannel access where multiple simultaneous transmissions can occur each spanning a subset of frequency bands. | 11-11-2010 |
20100329195 | METHOD AND APPARATUS FOR MULTI-STATION REQUEST MESSAGING - A process for wireless communications is disclosed herein that includes specifying transmission parameters for a plurality of wireless nodes in a single frame; and transmitting the single frame. An apparatus for performing the process is also disclosed herein. | 12-30-2010 |
20100329236 | METHOD AND APPARATUS FOR MULTIPLE USER UPLINK REQUIRING MINIMAL STATION TIMING AND FREQUENCY SYNCHRONIZATION - An apparatus is disclosed having a receiver configured to receive correction information; and a transmitter configured to transmit data based on the correction information through one or more antennas to one or more nodes. A method for wireless communications is also disclosed. The method includes sending correction information to a plurality of wireless nodes; receiving corrected data generated by at least one station of the plurality of wireless nodes based on the correction information; and spatially processing the corrected data. | 12-30-2010 |
20110002227 | MULTIUSER SCHEDULING IN WLAN SYSTEMS - An apparatus for wireless communications is provided including a processing system. The processing system is configured to determine path-losses between the apparatus and a plurality of wireless nodes, to group the plurality of wireless nodes into sets based on the determined path-losses, and to exchange data with at least one of the wireless nodes in one of the sets. | 01-06-2011 |
20110007640 | MULTIPLE PEER-TO-PEER SIGNALING - A method, an apparatus, and a computer program product operable in a wireless communication system are provided in which a first signal is generated for transmission to a wireless node to enable the wireless node to determine a first preferred beam pattern. A second preferred beam pattern is determined from a second signal received from the wireless node. The apparatus communicates with the wireless node through at least one of the first or second preferred beam pattern. | 01-13-2011 |
20110007676 | MULTIPLE PEER-TO-PEER SIGNALING - A method, an apparatus, and a computer program product operable in a wireless communication system are provided in which a first signal is generated for transmission to a wireless node to enable the wireless node to determine a first preferred beam pattern. A second preferred beam pattern is determined from a second signal received from the wireless node. The apparatus communicates with the wireless node through at least one of the first or second preferred beam pattern. | 01-13-2011 |
20110007721 | METHOD FOR DIRECTIONAL ASSOCIATION - A method, an apparatus, and a computer program product operable in a wireless communication system are provided in which an access probe is generated for transmission to a wireless node. A first signal is generated for transmission to the wireless node. The first signal includes information corresponding to a first preferred beam pattern from the wireless node to the apparatus. A second signal is received from the wireless node including information corresponding to a second preferred beam pattern from the apparatus to the wireless node. The second preferred beam pattern is determined based on the access probe. The apparatus communicates with the wireless node using at least one of the first preferred beam pattern or the second preferred beam pattern. | 01-13-2011 |
20110051636 | FLEXIBLE SDMA AND INTERFERENCE SUPPRESSION - Certain aspects of the present disclosure provide a method for performing interference suppression in spatial division multiple access (SDMA) systems. When the number of receive antennas of a receiver is equal or larger than the number of spatial streams intended for the receiver, the receiver may perform interference suppression on the signals received on all of its antennas. In addition, certain aspects of the present disclosure present a flexible SDMA technique in which a plurality of channel estimates that may be received from an explicit feedback or estimated implicitly, are combined. The combined channel estimate may be used in calculating the SDMA weights. | 03-03-2011 |
20110063991 | PHYSICAL LAYER SIGNALING OF CONTROL PARAMETERS - Certain aspects of the present disclosure relate to a technique for signaling common user parameters in Very High Throughput (VHT) wireless systems. | 03-17-2011 |
20110069629 | PHYSICAL LAYER METRICS TO SUPPORT ADAPTIVE STATION-DEPENDENT CHANNEL STATE INFORMATION FEEDBACK RATE IN MULTI-USER COMMUNICATION SYSTEMS - Certain aspects of the present disclosure present physical layer metrics for supporting adaptive station-dependent channel state information feedback rate in multi-user communication systems. For certain aspects, the physical layer metrics may be calculated at the stations and communicated to the AP. For certain aspects, the metrics may be calculated at an access point utilizing information about channel characteristics of stations available at the access point. | 03-24-2011 |
20110077044 | POWER CONTROL FOR WIRELESS LAN STATIONS - Techniques and apparatus for controlling the transmit power of an uplink (UL) signal from a user terminal in a wireless communications system in an effort to achieve some target characteristic, such as a target carrier-to-interference (C/I) ratio, at an access point (AP) are provided. In this manner, such a user terminal may help avoid or compensate for imbalances in received radio frequency (RF) power between UL signals received from multiple user terminals by the AP. For example, the transmit power at each user terminal may be controlled in an effort to achieve a target post-processing C/I ratio of 28 dB per spatial stream in an effort to reduce large power imbalances and optimize throughput per user terminal The user terminal and the AP may compose part of a multiple-input multiple-output (MIMO) communication system utilizing spatial-division multiple access (SDMA) techniques. | 03-31-2011 |
20110164576 | HEURISTIC ALGORITHM FOR CALCULATING TARGET SINR FOR MMSE BEAMFORMING - Certain aspects of the present disclosure provide a heuristic algorithm for calculating accurate target SINR values for the minimum mean square error (MMSE) beamforming algorithm to decrease the complexity of the MMSE algorithm. The heuristic algorithm for calculating target SINR values considers practical system constraints, such as frequency selective channels, power amplifier distortion, imperfect channel state information as well as limited computing power at the access point. | 07-07-2011 |
20110188482 | ENHANCEMENTS TO THE MU-MIMO VHT PREAMBLE TO ENABLE MODE DETECTION - Certain aspects of the present disclosure present a technique for enabling a receiver to detect mode of transmission of a signal based on a common field transmitted to all the receivers. The proposed technique includes frame structure in which information about the transmission mode is transmitted in a first portion of a SIG field to all the receivers. | 08-04-2011 |
20110194655 | METHODS AND APPARATUS TO PERFORM RESIDUAL FREQUENCY OFFSET ESTIMATION AND CORRECTION IN IEEE 802.11 WAVEFORMS - Methods and apparatus are provided for performing and utilizing residual frequency offset estimation and correction in Institute of Electrical and Electronics Engineers (IEEE) 802.11 waveforms. Certain aspects of the present disclosure provide a technique for enabling one to perform good channel estimation with a signal-to-noise ratio (SNR)>33 dB, even in the presence of residual frequency errors. Further, certain aspects may enable one to support uplink Spatial Division Multiple Access (UL-SDMA), even in the presence of residual frequency offsets at the client side. | 08-11-2011 |
20110199946 | METHOD AND APPARATUS FOR SUPPORTING ADAPTIVE CHANNEL STATE INFORMATION FEEDBACK RATE IN MULTI-USER COMMUNICATION SYSTEMS - Certain aspects of the present disclosure relate to techniques for achieving adaptive channel state information (CSI) feedback rate in multi-user communication systems. A rate by which CSI feedback can be transmitted from each user station of a wireless system to a serving access point may be adjusted based on evolution of a channel between that user station and the access point. | 08-18-2011 |
20110216659 | MULTIUSER SCHEDULING IN WLAN SYSTEMS - An apparatus for wireless communications is provided including a processing system. The processing system is configured to determine path-losses between the apparatus and a plurality of wireless nodes, to group the plurality of wireless nodes into sets based on the determined path-losses, and to exchange data with at least one of the wireless nodes in one of the sets. | 09-08-2011 |
20110222472 | PROTOCOL TO SUPPORT ADAPTIVE STATION-DEPENDENT CHANNEL STATE INFORMATION FEEDBACK RATE IN MULTI-USER COMMUNICATION SYSTEMS - Methods and apparatuses are proposed for supporting one or more user-dependent channel state information (CSI) feedback rates in a downlink spatial division multiple access (SDMA) system. For certain aspects, an access point (AP) may receive a channel evolution feedback from one or more stations and send a request for CSI to the stations whose CSI values need to be updated. For certain aspects, the AP may poll the stations for updated CSI values. For certain aspects, deterministic back-off timers may be assigned to the stations indicating when to send their CSI feedback. The proposed methods may improve system performance. | 09-15-2011 |
20110222473 | PROTOCOL TO SUPPORT ADAPTIVE STATION-DEPENDENT CHANNEL STATE INFORMATION FEEDBACK RATE IN MULTI-USER COMMUNICATION SYSTEMS - Methods and apparatuses are proposed for supporting one or more user-dependent channel state information (CSI) feedback rates in a downlink spatial division multiple access (SDMA) system. For certain aspects, an access point (AP) may receive a channel evolution feedback from one or more stations and send a request for CSI to the stations whose CSI values need to be updated. For certain aspects, the AP may poll the stations for updated CSI values. For certain aspects, deterministic back-off timers may be assigned to the stations indicating when to send their CSI feedback. The proposed methods may improve system performance. | 09-15-2011 |
20110228730 | SCHEDULING SIMULTANEOUS TRANSMISSIONS IN WIRELESS NETWORK - Certain aspects of the present disclosure relate to a technique for scheduling simultaneous communications of multiple pairs of wireless nodes in a wireless network. | 09-22-2011 |
20110235533 | PROTOCOL TO SUPPORT ADAPTIVE STATION-DEPENDENT CHANNEL STATE INFORMATION FEEDBACK RATE IN MULTI-USER COMMUNICATION SYSTEMS - Methods and apparatuses are proposed for supporting one or more user-dependent channel state information (CSI) feedback rates in a downlink spatial division multiple access (SDMA) system. For certain aspects, an access point (AP) may receive a channel evolution feedback from one or more stations and send a request for CSI to the stations whose CSI values need to be updated. For certain aspects, the AP may poll the stations for updated CSI values. For certain aspects, deterministic back-off timers may be assigned to the stations indicating when to send their CSI feedback. The proposed methods may improve system performance. | 09-29-2011 |
20110274056 | PROTOCOL FOR COMMUNICATION - Various methods and apparatuses for transmitting an allocation of time in a wireless communication system are disclosed. In one aspect, allocations of time for receiving and transmitting control communications are determined. The control communications may comprise a channel time request. | 11-10-2011 |
20110299480 | METHOD AND APPARATUS FOR SUPPORTING ADAPTIVE CHANNEL STATE INFORMATION FEEDBACK RATE IN MULTI-USER COMMUNICATION SYSTEMS - Certain aspects of the present disclosure relate to techniques for achieving adaptive channel state information (CSI) feedback rate in multi-user communication systems. A rate by which CSI feedback can be transmitted from each user station of a wireless system to a serving access point may be adjusted based on evolution of a channel between that user station and the access point. | 12-08-2011 |
20110310870 | HYBRID TIME AND FREQUENCY DOMAIN CSI FEEDBACK SCHEME - In a downlink multi-user multiple input multiple output (DL MU-MIMO) system, channel state information (CSI) feedback duration may strongly affect media access control (MAC) efficiency. While a time domain compression may give a significant reduction in feedback duration, the time domain compression may have complexity issues at the station (STA). In particular, for time domain compression, a large complex matrix multiplication may be required at the client to estimate a cyclic prefix (CP) length impulse response, which best models the frequency response of the channel. Embodiments of the invention comprise a hybrid scheme that may reduce the above complexity while maintaining significant compression gains. | 12-22-2011 |
20120039266 | EFFICIENT GROUP DEFINITION AND OVERLOADING FOR MULTIUSER MIMO TRANSMISSIONS - Certain aspects of the present disclosure present a technique for efficient group definition and overloading for downlink multiuser multiple-input multiple-output (MU-MIMO) transmissions. | 02-16-2012 |
20120058735 | SOUNDING FEEDBACK SCHEMES FOR VERY HIGH THROUGHPUT WIRELESS SYSTEMS - Certain aspects of the present disclosure relate to techniques for transmitting sounding feedback in Very High Throughput (VHT) wireless systems. The sounding feedback may be transmitted from a user station (STA), wherein the feedback may comprise a certain number of beamforming matrices and a certain number of singular values of a wireless channel associated with the STA. Further, the sounding feedback may comprise a bit for indicating whether this feedback represents a Single-User (SU) feedback or a Multi-User (MU) feedback. | 03-08-2012 |
20120063429 | METHODS AND APPARATUS OF FREQUENCY INTERLEAVING FOR 80 MHz TRANSMISSIONS - Certain aspects of the present disclosure provide techniques and apparatus for frequency interleaving for use with 80 MHz transmissions, such as those in the IEEE 802.11ac amendment to the IEEE 802.11 standard. According to certain aspects, frequency interleaving spatial streams for transmissions on channels having widths of about 80 MHz may comprise using an interleaving depth of 26. The number of frequency rotations may be 58 (or 29) for up to four (or up to eight) spatial streams. According to certain aspects, frequency interleaving up to eight (or up to four) spatial streams for transmission on channels having widths of about 80 MHz may comprise performing frequency rotation for each of the spatial streams based on a frequency rotation index=[0 4 2 6 1 5 3 7] (or=[0 2 1 3]). | 03-15-2012 |
20120076073 | PROTECTION MECHANISMS FOR MULTI-USER MIMO TRANSMISSIONS - Certain aspects of the present disclosure relate to techniques for medium reservation in the case of multi-user (MU) communications. Multiple mechanisms are supported for protecting MU transmissions, wherein appropriate control messages can be exchanged between an access point and served user stations before transmitting downlink data packets. | 03-29-2012 |
20120076081 | PROTECTION MECHANISMS FOR MULTI-USER MIMO TRANSMISSIONS - Certain aspects of the present disclosure relate to techniques for medium reservation in the case of multi-user (MU) communications. Multiple mechanisms are supported for protecting MU transmissions, wherein appropriate control messages can be exchanged between an access point and served user stations before transmitting downlink data packets. | 03-29-2012 |
20120082193 | BEAMFORMING FEEDBACK OPTIONS FOR MU-MIMO - Beamforming may be used in MIMO communication systems to further enhance spectral efficiency. Beamforming refers to beamed transmissions to a single destination (e.g., a station) at a time, to enhance the rate and/or range of transmission. To perform beamforming from a source to one or more destinations, a channel and/or beamforming matrices corresponding to the channel needs to be known at the source, which may be obtained as feedback from the destination. However, the beamforming matrices may not be smooth over frequency as it is fed back from the destination. Therefore, certain aspects of the present disclosure provide beamforming feedback options, resulting in the smoothness of the channel or a beamforming matrix corresponding to the channel. | 04-05-2012 |
20120087316 | PROTECTION MECHANISMS FOR MULTI-USER MIMO TRANSMISSIONS - Certain aspects of the present disclosure relate to techniques for medium reservation in the case of multi-user (MU) communications. Multiple mechanisms are supported for protecting MU transmissions, wherein appropriate control messages can be exchanged between an access point and served user stations before transmitting downlink data packets. | 04-12-2012 |
20120115536 | POWER CONTROL FOR TV WHITE SPACE DEVICES - Certain aspects of the present disclosure provide techniques and apparatus for using power control in a television white space (TVWS) network. One example method generally includes generating, at a first apparatus, a message for controlling a transmit power of a second apparatus—the message including a first indication of a first transmitter power backoff for the first apparatus and a second indication of a second transmitter power backoff for the second apparatus—and transmitting, to the second apparatus, the message based on the first transmitter power backoff. In this manner, messaging may be used to enable transmit power control of devices in a TVWS network, which may operate in accordance with the IEEE 802.11af standard. | 05-10-2012 |
20120117446 | PACKET-LEVEL ERASURE PROTECTION CODING IN AGGREGATED PACKET TRANSMISSIONS - In a first aspect, an aggregated packet (A-MPDU) includes packets (MPDUs) and EC-Blocks (Error Correction Blocks) containing error correction coding information. A transmitter uses a Fountain coding scheme (for example, Raptor or RaptorQ) to generate the error correction coding information from the MPDUs. If a receiver detects an error in a received MPDU, then the receiver uses the error correction coding information from the EC-Blocks to correct the error. In a second novel aspect, a determination is made as to whether a change in error rate is more likely due to collisions or to a low SNR. If the determination is that the change is due to collisions then the MCS index is adjusted to restore a target error rate, whereas if the determination is that the change is due to a low SNR then the number of EC-Blocks per A-MPDU is adjusted to restore the target error rate. | 05-10-2012 |
20120120931 | EFFICIENT GROUP ID MANAGEMENT FOR WIRELESS LOCAL AREA NETWORKS (WLANS) - Certain aspects of the present disclosure provide techniques and apparatus for efficiently managing overloaded group IDs for groups of stations (STAs) receiving simultaneous transmission in a multiuser multiple-input multiple-output (MU-MIMO) scheme. In this manner, overloading for some of the groups may allow flexibility at an access point (AP) to trade off between support for more STA combinations and power savings. As disclosed herein, the group ID management scheme may be flexible enough to support APs with both overloaded and non-overloaded groups and APs with only non-overloaded groups. This scheme also achieves these benefits for overloading with a low overhead. | 05-17-2012 |
20120140754 | METHOD FOR DIRECTIONAL ASSOCIATION - A method, an apparatus, and a computer program product operable in a wireless communication system are provided in which an access probe is generated for transmission to a wireless node. A first signal is generated for transmission to the wireless node. The first signal includes information corresponding to a first preferred beam pattern from the wireless node to the apparatus. A second signal is received from the wireless node including information corresponding to a second preferred beam pattern from the apparatus to the wireless node. The second preferred beam pattern is determined based on the access probe. The apparatus communicates with the wireless node using at least one of the first preferred beam pattern or the second preferred beam pattern. | 06-07-2012 |
20120140842 | SIGNALING TO PROTECT ADVANCED RECEIVER PERFORMANCE IN WIRELESS LOCAL AREA NETWORKS (LANS) - Certain aspects of the present disclosure relate to techniques that may be used to help control aspects of beamforming by a beamformee. According to certain aspects, a beamformee may be able to signal, to a beamformer, a maximum number of transmit spatial streams to use for single-user beamformed transmissions. | 06-07-2012 |
20120155447 | METHOD AND APPARATUS FOR SUPPORTING MODULATION-CODING SCHEME SET IN VERY HIGH THROUGHPUT WIRELESS SYSTEMS - Certain aspects of the present disclosure relate to techniques for designing Modulation-Coding Scheme (MSC) set fields in a transmission frame of Very High Throughput (VHT) wireless systems. | 06-21-2012 |
20120170563 | METHOD AND APPARATUS FOR IMPROVING THROUGHPUT OF 5 MHZ WLAN TRANSMISSIONS - Certain aspects of the present disclosure relate to techniques for improving a transmission throughput of communications based on IEEE 802.11af physical (PHY) layer in television white space (TVWS) spectrum. In one aspect, a transmission preamble with a Legacy Signal (L-SIG) field is constructed, wherein the L-SIG field comprises a code indicating duration of a cyclic prefix (CP) of a packet following the preamble. The transmissions can be performed using 5 MHz bandwidth of the TVWS spectrum. | 07-05-2012 |
20120177018 | PROTOCOL FOR CHANNEL STATE INFORMATION FEEDBACK - Certain aspects of the present disclosure relate to a low-overhead method for communicating Channel State Information (CSI) feedback in Very High Throughput (VHT) wireless communications systems. The present disclosure also provides packet formats for Null Data Packet Announcement (NDPA), CSI Poll and CSI feedback. In some cases, the CSI feedback may be too large to be carried in a single Media Access Control (MAC) protocol data unit (MPDU) or a Physical Layer (PHY) protocol data unit (PPDU), and a proposed protocol for CSI feedback segmentation can be then utilized. | 07-12-2012 |
20120182980 | METHOD AND APPARATUS FOR SAVING POWER BY USING SIGNAL FIELD OF PREAMBLE - Certain aspects of the present disclosure relate to a technique for power saving at mobile stations in Very High Throughput (VHT) systems using signal field bits of a preamble with a limited transmission overhead. The present disclosure proposes a method of indicating to a destination through a preamble cyclic redundancy check (CRC) checksum that the destination may be the intended destination of a transmission packet. The present disclosure also proposes a method of indicating to a destination through a preamble CRC that the destination may not be the intended destination of a transmission packet. In this case, decoding of the received packet can be terminated in order to save power at a receiving device. | 07-19-2012 |
20120213214 | DATA TRANSMISSION COEXISTENCE WITHIN TELEVISION WHITE SPACE CHANNELS - Methods, systems, and/or devices are provided that permit data transmissions over unused television channels. An unused channel within a television broadcast frequency spectrum is first identified. A downclocked waveform (for data transmission) is then generated by applying a factor to a clock that causes a waveform bandwidth to be reduced from a first bandwidth to a second bandwidth, wherein the second bandwidth of the downclocked waveform is less than a channel bandwidth for the identified unused channel. The downclocked waveform may then be configured so that it coexists with a larger waveform having a third bandwidth that is greater than the channel bandwidth. The downclocked waveform is then wirelessly transmitted from the transmitter device over the identified unused channel. | 08-23-2012 |
20120236971 | SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION IN SUB GIGAHERTZ BANDS - Systems, methods, and devices for wireless communication. In one aspect, an apparatus for wireless communication is provided. The apparatus includes a receiver configured to receive a wireless signal comprising a packet. At least a portion of the wireless signal is configured to be received over a bandwidth lower than or equal to 1.25 MHz. The packet is formed from at least one orthogonal frequency-division multiplexing (OFDM) symbol comprising thirty-two tones. The thirty-two tones correspond to frequency subcarriers within the bandwidth. The thirty-two tones of the at least one OFDM symbol are allocated as: twenty-four data tones, two pilot tones, five guard tones, and one direct current (DC) tone. The apparatus includes a processor configured to evaluate the wireless signal. The processor includes a transform module configured to convert the at least one OFDM symbol into a frequency domain signal using a thirty-two point mode. | 09-20-2012 |
20120238226 | DATA TRANSMISSION COEXISTENCE USING CONSTANT SYMBOL DURATION WITHIN TELEVISION WHITE SPACE CHANNELS - Methods, systems, and/or devices are provided that permit data transmissions over unused television channels. An unused channel within a television broadcast frequency spectrum is first identified. A downclocked waveform (for data transmission) is then generated by applying a factor to a clock that causes a waveform bandwidth to be reduced from a first bandwidth to a second bandwidth, wherein the second bandwidth of the downclocked waveform is less than a channel bandwidth for the identified unused channel. The downclocked waveform may then be configured so that it coexists with a larger waveform having a third bandwidth that is greater than the channel bandwidth. The downclocked waveform is then wirelessly transmitted from the transmitter device over the identified unused channel. | 09-20-2012 |
20120250543 | SYSTEMS AND METHODS FOR COMMUNICATION OF CHANNEL STATE INFORMATION - Certain aspects of the present disclosure relate to a technique for communicating Channel State Information (CSI) feedback. In some aspects, the CSI feedback is communicated in a very high throughput (VHT) wireless communications system. | 10-04-2012 |
20120250618 | SYSTEMS AND METHODS FOR COMMUNICATION OF CHANNEL STATE INFORMATION - Certain aspects of the present disclosure relate to a technique for communicating Channel State Information (CSI) feedback. In some aspects, the CSI feedback is communicated in a very high throughput (VHT) wireless communications system. | 10-04-2012 |
20120257567 | SYSTEMS AND METHODS FOR COMMUNICATION OF CHANNEL STATE INFORMATION - Certain aspects of the present disclosure relate to a technique for communicating Channel State Information (CSI) feedback. In some aspects, the CSI feedback is communicated in a very high throughput (VHT) wireless communications system. | 10-11-2012 |
20120257605 | SYSTEMS AND METHODS FOR COMMUNICATION OF CHANNEL STATE INFORMATION - Certain aspects of the present disclosure relate to a technique for communicating Channel State Information (CSI) feedback. In some aspects, the CSI feedback is communicated in a very high throughput (VHT) wireless communications system. | 10-11-2012 |
20120263156 | METHOD AND APPARATUS FOR GENERATING VARIOUS TRANSMISSION MODES FOR WLAN SYSTEMS - Certain aspects of the present disclosure relate to a technique for generating 40+40 MHz and 40+40+40+40 MHz transmission modes for IEEE 802.11 wireless communications systems using Very High Throughput (VHT) waveforms with application to Television White Space (TVWS) spectrum. | 10-18-2012 |
20120275376 | CHANNEL STATE INFORMATION FEEDBACK FRAME FORMAT AND FEEDBACK RULES FOR VERY HIGH THROUGHPUT WIRELESS SYSTEMS - Certain aspects of the present disclosure provide techniques and apparatus for generating a unified format of channel state information (CSI) feedback for Very High Throughput (VHT) wireless systems. One example method generally includes generating, at a first apparatus, a frame comprising information relating to SNR if a second apparatus is communicating with the first apparatus using single-user MIMO (SU-MIMO) or multi-user MIMO (MU-MIMO) and transmitting a signal based on the generated frame to the second apparatus. Another example method generally includes generating, at an apparatus, a structure comprising CSI, wherein the CSI includes one of a first matrix with estimates of a channel associated with the apparatus or a second matrix obtained based on singular value decomposition (SVD) of the first matrix and wherein the structure further comprises an indication of which of the first and second matrices is included in the CSI; and transmitting the structure over the channel. | 11-01-2012 |
20120281620 | BEAMFORMING FEEDBACK FORMAT - Certain aspects of the present disclosure propose transmitting a feedback message to an access point. The feedback may comprise a beamforming extension field, which may carry per tone signal to noise ratio of a station. For certain aspects, the station transmitting the per-tone SNR may be a single user (SU)-capable device. For certain aspects, the station may indicate to the access point whether or not it has a maximum likelihood (ML) receiver. | 11-08-2012 |
20120315938 | COMMUNICATION DEVICES FOR MULTIPLE GROUP COMMUNICATIONS - A base station for communicating with multiple groups of wireless communication devices is described. The base station includes a processor and executable instructions stored in memory that is in electronic communication with the processor. The base station determines a number of wireless communication devices. The base station also splits the number of wireless communication devices into groups. The base station further determines a precoding matrix for each group. The base station additionally transmits a beamformed signal to each group using the precoding matrix for each group. | 12-13-2012 |
20130010708 | GROUP ID ALLOCATION FOR DIRECT LINK SERVICE (DLS) - Certain aspects of the present disclosure provide techniques and apparatus for managing group identifiers (IDs) in multiuser multiple-input multiple-output (MU-MIMO) schemes to ensure that the group ID maps to the same assigned spatial stream position for a particular station (STA), for either Direct Link Service (DLS) or downlink (DL) MU-MIMO transmissions. One example method generally includes transmitting, form a first apparatus to a second apparatus, a message requesting assignment of a group ID identifying a group of apparatuses for receiving MU transmissions; and receiving, from the second apparatus, an indication of the assigned group ID, such that spatial stream assignments for the group of apparatuses are the same between the first and second apparatuses, the spatial stream assignments corresponding to the assigned group ID. | 01-10-2013 |
20130016670 | METHODS AND APPARATUSES FOR COMMUNICATING IN TELEVISION WHITE SPACE (TVWS) BASED ON TVWS ENABLEMENT SIGNAL - Certain aspects of the present disclosure relate to techniques for supporting television white space (TVWS) communication. In an aspect of the present disclosure, a low-rate TVWS enabler (Mode II wireless communication device) may provide initial enablement for all Mode I devices (e.g., access points and user terminals), as well as it may transmit a contact verification signal (CVS) on a regular basis to keep the Mode I devices enabled for the TVWS communication. | 01-17-2013 |
20130016760 | METHODS AND APPARATUSES FOR LOW-RATE TELEVISION WHITE SPACE (TVWS) ENABLEMENT - Certain aspects of the present disclosure relate to techniques for supporting television white space (TVWS) communication. In an aspect of the present disclosure, a low-rate TVWS enabler (Mode II wireless communication device) may provide initial enablement for all Mode I devices (e.g., access points and user terminals), as well as it may transmit a contact verification signal (CVS) on a regular basis to keep the Mode I devices enabled for the TVWS communication. | 01-17-2013 |
20130044680 | MANAGING TRANSMIT POWER FOR BETTER FREQUENCY RE-USE IN TV WHITE SPACE - Certain aspects of the present disclosure provide techniques and apparatus for managing transmit power in a television white space (TVWS) network. By managing transmit power as described herein, medium re-use may be improved in such a network, and unfair usage problems may be alleviated. One example method generally includes receiving, from an apparatus, a message with an indication of a highest transmit power used by the apparatus for transmitting data frames; and determining that the apparatus is a dominant interferer based, at least in part, on the highest transmit power. Another example method generally includes receiving, from an apparatus, a control or management message with a first indication of a first transmit power used by the apparatus for transmitting data frames; and determining that the apparatus is a dominant interferer based, at least in part, on the first transmit power. | 02-21-2013 |
20130044681 | MANAGING TRANSMIT POWER FOR BETTER FREQUENCY RE-USE IN TV WHITE SPACE - Certain aspects of the present disclosure provide techniques and apparatus for managing transmit power in a television white space (TVWS) network. By managing transmit power as described herein, medium re-use may be improved in such a network, and unfair usage problems may be alleviated. One example method generally includes receiving a request message comprising an indication of a modulation and coding scheme (MCS) for transmitting data frames to be received, determining a link margin based on the MCS, and transmitting a response message with an indication of the link margin. Another example method generally includes determining a MCS for transmitting data frames and transmitting a request message comprising an indication of the MCS. | 02-21-2013 |
20130058273 | STATION-CENTRIC MULTI-USER MULTIPLE INPUT MULTIPLE OUTPUT (MU-MIMO) - Certain aspects of the present disclosure provide techniques and apparatus for using a Media Access Control (MAC) address of a station (STA) sending a direct link multi-user multiple-input multiple-output (MU-MIMO) transmission such that one or more STAs receiving the transmission may interpret a group identifier (ID) indicating a group to which the STAs belong. Using the group ID and the MAC address allows a STA to independently manage its group IDs, independent of an access point (AP) or other STAs in a Basic Service Set (BSS). | 03-07-2013 |
20130070748 | EFFICIENT GROUP ID MANAGEMENT FOR WIRELESS LOCAL AREA NETWORKS (WLANs) - Certain aspects of the present disclosure provide techniques and apparatus for efficiently managing groups of stations (STAs) receiving simultaneous transmissions in a multiuser multiple-input multiple-output (MU-MIMO) scheme. One example method generally includes; for a first apparatus in a number of groups of apparatuses, allocating a first spatial stream position for each of at least one first group in the number of the groups; and transmitting a first unicast message to the first apparatus, wherein the first unicast message comprises an indication of the allocated spatial stream position for each of the at least one first group and, for each group in the number of the groups, an indication of a membership status, in the group, of the first apparatus. | 03-21-2013 |
20130094619 | SYSTEMS AND METHODS FOR PACKET DETECTION - Systems, methods, and devices for detecting packets in signals are described herein. The apparatus comprises a receiver configured to receive a signal comprising a plurality of samples. The apparatus comprises circuitry. The circuitry is configured to apply a match filter to the plurality of samples to produce a plurality of blocks of samples, each block comprising a number of samples. The circuitry is configured to correlate a subset of the samples of a first block with a subset of the samples of a second block to produce an output. The circuitry is configured to compare the output to a threshold value to determine whether the signal comprises a data packet. | 04-18-2013 |
20130107830 | CHANNEL SELECTION RULES FOR SUB-1-GHz BASIC SERVICE SETS | 05-02-2013 |
20130107981 | SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION OF LONG DATA UNITS | 05-02-2013 |
20130121243 | SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION OF PACKETS HAVING A PLURALITY OF FORMATS - Systems and methods for communicating packets having a plurality of formats are described herein. In some aspects, a signal (SIG) field in the preamble of a packet may indicate whether an extension field, such as an extension SIG field or SIG-B field, is included in the packet. In another aspect, one or more detectors may be used to auto-detect packets formatted as one of at least two different formats based on a short training field (STF) of a received packet. In some aspects, along training field (LTF) in the preamble of a packet may indicate whether the payload is repetition coded. | 05-16-2013 |
20130121244 | SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION OF PACKETS HAVING A PLURALITY OF FORMATS - Systems and methods for communicating packets having a plurality of formats are described herein. In some aspects, a signal (SIG) field in the preamble of a packet may indicate whether an extension field, such as an extension SIG field or SIG-B field, is included in the packet. In another aspect, one or more detectors may be used to auto-detect packets formatted as one of at least two different formats based on a short training field (STF) of a received packet. In some aspects, along training field (LTF) in the preamble of a packet may indicate whether the payload is repetition coded. | 05-16-2013 |
20130121245 | SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION OF PACKETS HAVING A PLURALITY OF FORMATS - Systems and methods for communicating packets having a plurality of formats are described herein. In some aspects, a signal (SIG) field in the preamble of a packet may indicate whether an extension field, such as an extension SIG field or SIG-B field, is included in the packet. In another aspect, one or more detectors may be used to auto-detect packets formatted as one of at least two different formats based on a short training field (STF) of a received packet. In some aspects, along training field (LTF) in the preamble of a packet may indicate whether the payload is repetition coded. | 05-16-2013 |
20130128806 | SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION OF PACKETS HAVING A PLURALITY OF FORMATS - Systems and methods for communicating packets having a plurality of formats are described herein. In some aspects, a signal (SIG) field in the preamble of a packet may indicate whether an extension field, such as an extension SIG field or SIG-B field, is included in the packet. In another aspect, one or more detectors may be used to auto-detect packets formatted as one of at least two different formats based on a short training field (STF) of a received packet. In some aspects, along training field (LTF) in the preamble of a packet may indicate whether the payload is repetition coded. | 05-23-2013 |
20130128807 | PREAMBLE DESIGN FOR TELEVISION WHITE SPACE TRANSMISSIONS - A method for generating a Physical Layer Convergence Protocol Packet Data Unit (PPDU) having a preamble and a payload for television white space transmission (TVWS) is provided. The symbols of the PPDU each include 128 total (orthogonal frequency-division multiplexing) OFDM tones or 256 total OFDM tones. The preamble includes a signal (SIG) field symbol having 108 OFDM data tones if the symbols of the PPDU include 128 total OFDM tones or having 234 OFDM data tones if the symbols of the PPDU include 256 total OFDM tones. The SIG field symbol indicates at least one of an amount of data in the payload or a length of time that the PPDU will occupy the television broadcast frequency spectrum. The PPDU is generated by down-clocking an 802.11ac signal by a factor so that the bandwidth of the PPDU decreases down to one appropriate for use in a TVWS channel. | 05-23-2013 |
20130142094 | SYSTEMS AND METHODS FOR FRAME FILTERING AND FOR ENABLING FRAME FILTERING - The disclosure provides systems, methods, and apparatus for early receive chain shutoff using a typified CRC and/or content change indicator signals. In one aspect, a method for low power frame filtering is provided. The method comprises generating a typified checksum based on a transaction identifier and at least a portion of a packet. The method further comprises transmitting, to at least one receiver, the packet comprising the typified checksum. | 06-06-2013 |
20130142275 | SYSTEMS AND METHODS FOR COMMUNICATION OVER A PLURALITY OF FREQUENCIES AND STREAMS - Methods and devices for communicating in a communication system are described herein. One aspect provides a method of communicating over one or more space-time streams. The method includes transmitting a first stream with a bandwidth of 2 MHz or less. The method further includes transmitting, when there are at least two streams, a second stream with a cyclic shift delay relative to the first stream equal to half a period. The method further includes transmitting, when there are at least three streams, a third stream with a cyclic shift delay relative to one of the first and second stream equal to a quarter of the period. The method further includes transmitting, when there are at least four streams, a fourth stream with a cyclic shift delay relative to the other of the first and second stream equal to a quarter of the period. | 06-06-2013 |
20130142276 | SYSTEMS AND METHODS FOR COMMUNICATION OVER A PLURALITY OF FREQUENCIES AND STREAMS - Methods and devices for communicating in a communication system are described herein. One aspect of the subject matter described in the disclosure provides a method of communicating over one or more space-time streams. The method includes transmitting a precoded portion of a first stream with a bandwidth of 1 MHz or less. The method further includes transmitting, when there are at least two streams, a precoded portion of a second stream with a cyclic shift delay, relative to the first stream, of 4 μs. The method further includes transmitting, when there are at least three streams, a precoded portion of a third stream with a cyclic shift delay, relative to the first stream, of 1 μs. The method further includes transmitting, when there are at least four streams, a precoded portion of a fourth stream with a cyclic shift delay, relative to the first stream, of 5 μs. | 06-06-2013 |
20130148517 | MANAGING TRANSMIT POWER FOR BETTER FREQUENCY RE-USE IN TV WHITE SPACE - Certain aspects of the present disclosure provide techniques and apparatus for managing transmit power in a television white space (TVWS) network. One example method generally includes transmitting a sequence of request-to-send (RTS) messages at different transmit power levels to an apparatus and determining if a clear-to-send (CTS) message was received in response to at least one of the RTS messages corresponding to a particular one of the transmit power levels. Another example method generally includes receiving, at a first apparatus from a second apparatus, a packet that cannot be decoded by the first apparatus; determining at least one of a time or a duration corresponding to the packet; transmitting a query with an indication of the at least one of the time or the duration; and receiving a message from the second apparatus in response to the query, the message identifying the second apparatus as a source of the packet. | 06-13-2013 |
20130170411 | SIGNAL UNIT INCLUDING A FIELD INDICATIVE OF A ZERO-LENGTH PAYLOAD - A method includes receiving, at a first wireless device from a second wireless device, a signal (SIG) unit including a first field. The method also includes determining whether the first field has a particular value that is indicative of a zero-length payload and decoding the SIG unit based at least in part on the determination. | 07-04-2013 |
20130170523 | SYSTEMS AND METHODS FOR MANAGING ON-TIME OF WIRELESS RECEIVERS - Systems, methods, and devices for communicating in a wireless network are described herein. In an aspect, a method of transmitting a data unit includes generating a data unit. The data unit includes one or more short training field (STF) sequences. The method further includes encoding each of the STF sequences with a pseudo-random spreading code. The code is based on an addressee of the data unit. The method further includes transmitting, at a transmitter, the data unit over a wireless channel. In another aspect, a method of processing a data unit includes receiving, at a receiver, a data unit. The data unit includes one or more STF sequences. The method further includes determining whether the data unit comprises one or more differentially encoded symbols. The method further includes receiving one or more long training field (LTF) sequences when the data unit does not comprise one or more differentially encoded symbols. | 07-04-2013 |
20130176879 | PHASE AND AMPLITUDE TRACKING IN THE PRESENCE OF A WALKING PILOT SIGNAL - A method and apparatus for tracking amplitude and phase of a received low frequency signal comprising a walking pilot signal is disclosed, wherein the pilot signal changes in frequency a number of times according to a sequence that repeats. The design includes initializing a FIFO buffer and summing estimated channel power over the sequence to determine an initial total power. The design also includes, for a new received symbol, determining an updated power estimate for the new received symbol, placing the updated power estimate in the FIFO buffer, and removing a least current value from the FIFO buffer, and estimating amplitude of the signal using a sum of all updated power estimates in the FIFO buffer divided by the initial total power. The design may further include determining a delta phase value using maximum ratio combining scaled with a scaling factor. | 07-11-2013 |
20130177090 | SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION OF LONG DATA UNITS - Systems, methods, and devices for communicating long packets are described herein. In one aspect, an apparatus for wireless communication includes a receiver and a processor. The receiver wirelessly receives via wireless local area network a data unit comprising a plurality of training fields interposed between data symbols. The plurality of training fields includes a first training field followed by a second training field. The first training field includes a gain control sequence, and the second training field includes a channel estimation sequence. The processor decodes at least one data symbol based on the plurality of training fields. In another aspect, an apparatus for wireless communication includes a processor and a transmitter. The processor generates a data unit comprising a plurality of training fields inserted between data symbols, and the transmitter wirelessly transmits the data unit via wireless local area network. | 07-11-2013 |
20130179755 | SYSTEMS AND METHODS FOR LOW DENSITY PARITY CHECK TONE MAPPING - This disclosure provides systems, methods, and apparatus, including non-transitory computer-readable medium for tone mapping an error correction code for 1 MHz OFDM transmission. In one aspect, a wireless communications apparatus is provided. The wireless communications apparatus includes a tone mapper configured to tone map at least error correction codeword to data tones of an orthogonal frequency-division multiplexing (OFDM) symbol based on an error correction code tone mapping distance selected from the group consisting of 2, 3, and 4. The OFDM symbol has twenty four data tones, at least one pilot tone, a DC tone, and at least one guard tone. The wireless communications apparatus further includes a transmit module configured to transmit the at least one tone mapped error correction codeword using about a 1 MHz OFDM transmission mode. | 07-11-2013 |
20130195036 | SYSTEMS AND METHODS FOR NARROWBAND CHANNEL SELECTION - Systems, methods, and devices for narrowband channel selection in a wireless communications network are described herein. In one aspect, a wireless communications device includes a receiver, processor, and transmitter. The receiver is configured to wirelessly receive messages from a first device over a plurality of channels. The processor is configured to estimate a quality of each channel based on one message received from the first device over each channel, select for wireless communication a first channel of the plurality of channels based on the estimated quality of each channel, and prepare a selection message indicating selection of the first channel for wireless communication. The transmitter is configured to transmit the selection message to the first device. | 08-01-2013 |
20130208821 | SYSTEMS, METHODS, AND DEVICES TO PERFORM INTERLEAVING - An apparatus includes an interleaver configured to interleave encoded data and to output a series of interleaved bits to be transmitted via a 1 MHz orthogonal frequency-division multiplexing (OFDM) transmission. The apparatus also includes a modulator configured to modulate the interleaved bits and a transform module configured to transform the modulated bits. A transmit module of the apparatus is configured to transmit the transformed bits included in one or more spatial streams of the 1 MHz OFDM transmission. | 08-15-2013 |
20130215993 | SYSTEMS AND METHODS FOR DETECTING TRANSMISSIONS BASED ON 32-POINT AND 64-POINT FAST FOURIER TRANSFORMS - Systems, methods, and devices for communicating and detecting training sequences are described herein. In one aspect, a method of wireless communication is provided. The method comprises receiving one or more short training field (STF) sequences comprising sixty-four values or less. The STF sequences comprise zero and non-zero values. The non-zero values are located at one or more indices of the STF that are separated by a multiple of at least four. The method further comprises determining a first correlation between the STF and the STF shifted by a first shift length. The method further comprises determining a second correlation between the STF and the STF shifted by a second shift length. The method further comprises determining a fast Fourier transform (FFT) size based on the first correlation and the second correlation. The method further comprises decoding one or more data symbols based at least in part on the determined FFT size. | 08-22-2013 |
20130230120 | APPARATUS AND METHODS FOR LONG AND SHORT TRAINING SEQUENCES FOR A FAST FOURIER TRANSFORM - Apparatus and methods for communicating and applying training sequences are described herein. For example, provided is a method for generating a short training field (STF) sequence comprising thirty two values or less. The STF sequence can include a first subset of values including zero and non-zero values. The non-zero values can be located at indices of the first subset that are at least a multiple of two, and can be a multiple of four. The STF sequence includes a second subset of zero values that can include all values not included within the first subset. The method further includes transmitting a data unit comprising the STF sequence over a wireless channel. In another example, a method is provided that includes generating a long training field (LTF) sequence comprising thirty two values or less, and transmitting a data unit comprising the LTF sequence over a wireless channel. | 09-05-2013 |
20130235760 | SYSTEMS AND METHODS FOR ESTABLISHING A CONNECTION SETUP THROUGH RELAYS - Systems, methods, and devices for discovering a wireless communications network are described herein. In some aspects, a transmitter of a station is configured to transmit a probe request. The probe request is addressed to one of a wildcard service set identifier and a service set identifier of a service set in which a relay operates. A receiver of the station is configured to receive a probe request response from the relay. The probe response comprises an identification of an access point the relay is associated with and capabilities of the relay. | 09-12-2013 |
20130235788 | SYSTEMS AND METHODS FOR ESTABLISHING A CONNECTION SETUP THROUGH RELAYS - Systems, methods, and devices for communicating data in a wireless communications network are described herein. In some aspects, an access point is configured to receive a request for relay connection and to transmit a message to at least one relay based on the received request for relay connection. The message comprises an instruction to transmit a setup response frame. A station is configured to transmit the request for relay connection to the access point and to select one of the at least one relay based on at least one setup response frame received from at least one of the at least one relay. The selected one of the at least one relay is configured to relay data packets between the station and the access point. | 09-12-2013 |
20130235789 | SYSTEMS AND METHODS FOR ESTABLISHING A CONNECTION SETUP THROUGH RELAYS - Systems, methods, and devices for registering a relay in a wireless communications network are described herein. In some aspects, a device is configured to operate as a relay and to transmit an association message. The association message comprises capabilities of the device and an indication of whether the device relays uplink traffic, downlink traffic, or both. An access point is configured to receive the association message to associate the device with the access point based on the association message and to transmit a beacon message to a station. The beacon message comprises an indication of whether the access point is associated with a relay. | 09-12-2013 |
20130235790 | SYSTEMS AND METHODS FOR ESTABLISHING A CONNECTION SETUP THROUGH RELAYS - Systems, methods, and devices for communicating data in a wireless communications network are described herein. In some aspects, a receiver of a relay is configured to receive a relay initiator frame and a data frame. A transmitter of the relay is configured to transmit an amplified version of the data frame at a same or substantially same time as a time that the data frame is received if the relay initiator frame is received prior to the data frame. | 09-12-2013 |
20130235791 | SYSTEMS AND METHODS FOR ESTABLISHING A CONNECTION SETUP THROUGH RELAYS - Systems, methods, and devices for setting up a relay in a wireless communications network are described herein. In some aspects, a transmitter of a station is configured to transmit a relay request to an access point. The access point is configured to transmit a discovery request frame based on the relay request to at least one relay. Each of the at least one relay is configured to transmit a discovery message based on the discovery request frame to the station. A processor of the station is configured to select one relay of the at least one relay based on each received discovery message. The transmitter is further configured to transmit a message comprising an identification of the selected one relay of the at least one relay to the access point. | 09-12-2013 |
20130235792 | SYSTEMS AND METHODS FOR ESTABLISHING A CONNECTION SETUP THROUGH RELAYS - Systems, methods, and devices for securely communicating data are described herein. In some aspects, a station is configured to communicate with an access point. A relay includes an uncontrolled port and a controlled port. The relay is configured to forward association, authentication, and secure relay setup frames between the station and the access point through the uncontrolled port. The relay is configured to forward data packets between the station and the access point through the uncontrolled port once the station establishes a relay relationship with the relay. | 09-12-2013 |
20130235860 | DUAL INTERPRETATION OF A LENGTH FIELD OF A SIGNAL UNIT - A method includes receiving, at a first wireless device from a second wireless device, a signal (SIG) unit including a length field and an aggregation field. The length field is interpreted as a number of symbols in response to determining that the aggregation field has a first value. The length field is interpreted as a number of bytes in response to determining that the aggregation field has a second value. | 09-12-2013 |
20130242875 | METHOD AND APPARATUS TO PERFORM RANGING OPERATIONS FOR WIRELESS STATIONS - Certain embodiments provide methods and apparatus for adjusting timing in an SDMA system. One method for adjusting the timing of packet transmissions in a wireless communications system, that may be performed by an access point, includes receiving ranging signals from a plurality of wireless network nodes, determining timing adjustment information for adjusting starting timing of packet transmissions from the wireless network nodes based on the ranging signals, and communicating the timing adjustment information to the wireless network nodes. | 09-19-2013 |
20130243115 | SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION IN SUB GIGAHERTZ BANDS - Systems, methods, and devices for wireless communication. In one aspect, an apparatus for wireless communication is provided. The apparatus includes a receiver configured to receive a wireless signal comprising a packet. At least a portion of the wireless signal is configured to be received over a bandwidth lower than or equal to 1.25 MHz. The packet is formed from at least one orthogonal frequency-division multiplexing (OFDM) symbol comprising thirty-two tones. The thirty-two tones correspond to frequency subcarriers within the bandwidth. The thirty-two tones of the at least one OFDM symbol are allocated as: twenty-four data tones, two pilot tones, five guard tones, and one direct current (DC) tone. The apparatus includes a processor configured to evaluate the wireless signal. The processor includes a transform module configured to convert the at least one OFDM symbol into a frequency domain signal using a thirty-two point mode. | 09-19-2013 |
20130258955 | MODULATION AND CODING SCHEMES IN SUB-1 GHZ NETWORKS - Systems and methods of controlling characteristics of messages in sub-1 GHz networks (e.g., IEEE 802.11ah networks) are disclosed. One or more data structures indicating available modulation and coding schemes (MCSs) may be stored at or accessible to transmitters and receivers. The data structures may be organized based on an MCS index, a frame format, a wireless network bandwidth, and/or the number of spatial streams in use at the wireless network. Information stored in the data structures may be used in generation and processing of messages communicated via the sub-1 GHz network. | 10-03-2013 |
20130266083 | SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION IN SUB GIGAHERTZ BANDS - Systems, methods, and devices for wireless communication. In one aspect, an apparatus for wireless communication is provided. The apparatus includes a receiver configured to receive a wireless signal comprising a packet over a bandwidth. The packet includes a preamble portion comprising a signaling (SIG) field. A first portion of the SIG field is received over a first bandwidth within the bandwidth. A second portion of the SIG field is received after the first portion, the second portion received over a second bandwidth within the bandwidth. The first bandwidth is different than the second bandwidth, The second portion is replicated at least once within the bandwidth. The apparatus further includes a processor configured to evaluate the wireless signal including at least one of the first or second portions of the SIG field. | 10-10-2013 |
20130266086 | SYSTEMS AND METHODS FOR TRANSMITTING PILOT TONES - Systems and methods for using travelling pilots for channel estimation are described herein. In one aspect, wireless communications apparatus is described that comprises a processor configured to divide a plurality of tones on which pilot signals are to be transmitted among a plurality of symbols, wherein each symbol includes less than all of the plurality of tones and the plurality of symbols includes at least a subset of the plurality of tones. The wireless communication apparatus further comprises a transmitter configured to transmit, during a given symbol, pilot signals on the tones included in the given symbol, wherein the tones over which the pilot signals are transmitted are changed from symbol to symbol. | 10-10-2013 |
20130272147 | SYSTEMS AND METHODS OF USING SPACE TIME BLOCK CODES - In a particular embodiment, a method includes applying a first stream to antenna mapping scheme to a preamble portion of a packet. The method further includes applying a second stream to antenna mapping scheme to a data portion of the packet. The second stream to antenna mapping scheme is applied to the data portion of the packet but not to the preamble portion of the packet. The second stream to antenna mapping scheme includes a circulation scheme or a cyclic delay diversity (CDD) scheme. | 10-17-2013 |
20130272211 | SCHEDULING ALGORITHMS FOR IEEE 802.11 MULTI-USER (MU) MULTIPLE-INPUT MULTIPLE-OUTPUT (MIMO) COMMUNICATION SYSTEMS - A method is provided for wirelessly transmitting from a transmitter to one or more receivers within a multi-user (MU) multiple-input and multiple-output (MIMO) communication system. A number of concurrent (spatial) streams are dynamically allocated in a MU-MIMO transmission to each of a plurality of served receivers to maximize total data transmitted on each transmission. Streams are allocated according to a corresponding transmission queue length for each receiver and the number of receive antennas used by each of the served receivers. A transmission timer is started upon sending the transmission. A random backoff counter is also started upon one of either: (a) expiration of the transmission timer or (b) receipt of data at a transmission queue. A new transmission is sent upon expiration of the random backoff counter if the transmission timer has expired. Otherwise, the random backoff counter is restarted one or more times until the transmission timer has expired. | 10-17-2013 |
20130272282 | TONE SCALING PARAMETERS IN SUB-1 GHZ NETWORKS - Systems and methods of controlling characteristics of messages in sub-1 GHz networks (e.g., IEEE 802.11ah networks) are disclosed. One or more data structures indicating tone scaling parameters may be stored at or accessible to transmitters and receivers. The data structures may be organized based on a frame format, a wireless network bandwidth, and/or the number of spatial streams in use at the wireless network. Information stored in the data structures may be used in generation and processing of messages communicated via the sub-1 GHz network. | 10-17-2013 |
20130279379 | SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION OF LONG DATA UNITS - Systems and methods for communicating the length of a data unit and determining control data based thereon are described herein. In some aspects, a processor and a transmitter are provided. The processor may be configured to determine a measurement unit for representing the length of a data unit, the data unit including a midamble, the measurement unit being at least one of bytes or symbols. The processor may further generate a value indicating the length of the data unit based at least in part on the unit, an encoding scheme associated with the data unit, and a guard interval associated with the data unit. The generated value may be included in the data unit. The transmitter may be configured to transmit via wireless network the data unit to one or more devices. | 10-24-2013 |
20130286961 | SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION OF LONG DATA UNITS - Systems and methods for communicating long packets are described herein. In some aspects, an apparatus for wireless communication includes a processor and transmitter. The processor is configured to determine a modulation coding scheme (MCS) of a plurality of MCSs for a plurality of data symbols, each MCS of the plurality of MCS having a different MCS index value. Further, the processor is configured to generate a data unit comprising a set of training fields periodically inserted between the plurality of data symbols after every n number of data symbols, where n depends on the MCS index value of the MCS. The transmitter is configured to transmit wirelessly via wireless local area network the data unit to one or more devices. | 10-31-2013 |
20130315262 | FRAME FORMATS AND TIMING PARAMETERS IN SUB-1 GHZ NETWORKS - Systems and methods of controlling characteristics of messages in sub-1 GHz networks (e.g., IEEE 802.11ah networks) are disclosed. One or more data structures indicating available frame formats and/or timing parameters may be stored at or accessible to transmitters and receivers. The data structures may be organized based on a frame format, a wireless network bandwidth, and/or the number of spatial streams in use at the wireless network. Information stored in the data structures may be used in generation and processing of messages communicated via the sub-1 GHz network. | 11-28-2013 |
20130343433 | SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION IN SUB GIGAHERTZ BANDS - Systems, methods, and devices for wireless communication are provided. In one aspect, an apparatus for wireless communication is provided. The apparatus includes a processor configured to generate a packet for transmission via a wireless signal. The packet is generated for transmission over a bandwidth of 1 MHz using at least one orthogonal frequency-division multiplexing (OFDM) symbol. The apparatus further includes a transmitter configured to transmit the packet via the wireless signal having unique power spectral density characteristics. | 12-26-2013 |
20130343478 | SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION IN SUB GIGAHERTZ BANDS - Systems, methods, and devices for wireless communication are provided. In one aspect, an apparatus for wireless communication is provided. The apparatus includes a processor configured to generate a packet for transmission via a wireless signal. The packet is generated for transmission over a bandwidth of 1 MHz using at least one orthogonal frequency-division multiplexing (OFDM) symbol. The apparatus further includes a transmitter configured to transmit the packet via the wireless signal having unique power spectral density characteristics. | 12-26-2013 |
20140029697 | GMSK-Based Modulation in a Wireless Local Area Network - A method includes modulating, at a first wireless device, a first signal based on a Gaussian minimum shift keying (GMSK) modulation scheme to generate a modulated signal. The method also includes amplifying, at the first wireless device, the modulated signal using a nonlinear power amplifier to generate an output signal. The method further includes transmitting, from the first wireless device to a second wireless device, an output signal generated based on the modulated signal via a wireless local area network (WLAN) that is compliant with an Institute of Electrical and Electronics Engineer (IEEE) 802.11ah specification. | 01-30-2014 |
20140064221 | BEAMFORMING FEEDBACK OPTIONS FOR MU-MIMO - Beamforming may be used in MIMO communication systems to further enhance spectral efficiency. Beamforming refers to beamed transmissions to a single destination (e.g., a station) at a time, to enhance the rate and/or range of transmission. To perform beamforming from a source to one or more destinations, a channel and/or beamforming matrices corresponding to the channel needs to be known at the source, which may be obtained as feedback from the destination. However, the beamforming matrices may not be smooth over frequency as it is fed back from the destination. Therefore, certain aspects of the present disclosure provide beamforming feedback options, resulting in the smoothness of a beamforming matrix. | 03-06-2014 |
20140064396 | BEAMFORMING FEEDBACK OPTIONS FOR MU-MIMO - Beamforming may be used in MIMO communication systems to further enhance spectral efficiency. Beamforming refers to beamed transmissions to a single destination (e.g., a station) at a time, to enhance the rate and/or range of transmission. To perform beamforming from a source to one or more destinations, a channel and/or beamforming matrices corresponding to the channel needs to be known at the source, which may be obtained as feedback from the destination. However, the beamforming matrices may not be smooth over frequency as it is fed back from the destination. Therefore, certain aspects of the present disclosure provide beamforming feedback options, resulting in the smoothness of a beamforming matrix. | 03-06-2014 |
20140071955 | Dynamic Sounding Control In Wifi - A method of performing dynamic sounding in a wireless communication device includes determining whether to perform sounding based on an age of current channel state information (CSI). An achievable throughput can be recorded as a reference throughput after performing the sounding. A current achievable throughput can be compared with the reference throughput. A CSI timestamp can be reset when the current throughput is above the reference throughput by a first predetermined amount, thereby prolonging a lifespan of the current CSI. The CSI timestamp can be reduced when the current throughput is below the reference throughput by a second predetermined amount, thereby reducing the lifespan of the current CSI. | 03-13-2014 |
20140077997 | SYSTEMS AND METHODS OF CONTROLLING ANTENNA RADIATION PATTERNS - In a particular embodiment, a method of controlling a radiation pattern includes selecting a signal processing characteristic to vary based on a radiation pattern to be emitted by an antenna array of a wireless device, wherein the antenna array includes a plurality of antennas, wherein the signal processing characteristic provides a target resultant radiation pattern, and wherein the signal processing characteristic is applies to less than all elements of the antenna array, and varying the signal processing characteristic across time, frequency, or a combination thereof. | 03-20-2014 |
20140078920 | SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION - Systems, methods, and devices for wireless communication. In one aspect, an apparatus for wireless communication is provided. The apparatus includes a receiver configured to receive a wireless signal comprising a packet. At least a portion of the wireless signal may be received over a channel with a channel bandwidth of at least approximately five hundred megahertz. The packet may be formed from at least one orthogonal frequency-division multiplexing (OFDM) symbol comprising at least one hundred and twenty-eight tones. The apparatus further comprises a processor configured to evaluate the wireless signal. The processor may comprise a transform module configured to convert the at least one OFDM symbol into a frequency domain signal. | 03-20-2014 |
20140079145 | APPARATUS AND METHODS FOR WIRELESS COMMUNICATION IN POWER-RESTRICTED FREQUENCY BANDS - Apparatuses, methods, and devices for wireless communication. One aspect of the subject matter described in the disclosure provides a method of selecting one of a plurality of antennas. The method includes receiving, at a first antenna, a first training field of a training frame. The method further includes receiving, at a second antenna, a second training field of the training frame. The method further includes selecting one of the first and second antennas based on at least one training field. | 03-20-2014 |
20140119410 | SYSTEM AND METHOD FOR COMMUNICATION USING HYBRID SIGNALS - Systems and methods for communication using hybrid signals are disclosed. In one aspect an apparatus for communication includes a processing system configured to encode a first set of information in a plurality of symbols and to encode a second set of information according to a spacing among the symbols. The apparatus may further comprise a transmitter configured to transmit to a device the symbols with the spacing among the symbols. In another aspect, an apparatus for communication includes a processing system configured to decode a first set of information from a plurality of symbols encoded with the first set of information or a second set of information from a spacing among the symbols by determining the spacing among the symbols. The apparatus may further comprise a receiver configured to receive the symbols via a wireless communication. | 05-01-2014 |
20140126471 | SYSTEM AND METHOD FOR TUNING MEDIUM ACCESS PARAMETERS - Systems and methods for tuning media access parameters are disclosed. In one aspect an access point includes a receiver configured to receive at least one message from a second access point. The access point further includes a processor configured to coordinate with the second access point to select a value of a medium access parameter comprising one of a carrier sense threshold and an energy detection threshold for a wireless station. The processor may generate a message identifying the value of the medium access parameter and may further comprise a transmitter connected to the processor and configured to transmit the message to the station. | 05-08-2014 |
20140126580 | METHOD, DEVICE, AND APPARATUS FOR ERROR DETECTION AND CORRECTION IN WIRELESS COMMUNICATIONS - Systems and methods for communicating in a wireless communication system are described. Various processes for detecting and correcting communication errors described. In aspect a method in a wireless communication system is provided. The method includes transmitting a first packet from a sending device to a receiving device. The method further includes listening for an acknowledgement during a first time period. The method further includes transmitting a second packet to the receiving device after a second time period, when an acknowledgement is not received during the first time period. The second packet includes one or more error-correction codes operable to recover the first packet. | 05-08-2014 |
20140128066 | SYSTEMS AND METHODS FOR IMPROVED ASSOCIATION IN WIRELESS NETWORKS - Systems, methods, and devices for communicating in a wireless network are provided. In some aspects, an access point may comprise a receiver configured to receive an access request message from a wireless station, the message comprising an indication of a plurality of network connection available to the wireless station including a link to a second access point. The receiver may be further configured to receive connectivity information associated with the link, based on the indication, from the second access point. The access point may further comprise a processor configured to determine whether to grant access to the wireless station based, at least in part, on the indication and the connectivity information, and a transmitter configured to transmit a response to the wireless station based on the determining. | 05-08-2014 |
20140153507 | SYSTEMS AND METHODS FOR PHASE ROTATING DUPLICATE FRAMES IN WIRELESS LAN TRANSMISSION - Methods, devices, and computer program products for optimally phase rotating duplicate frames in wireless LAN transmissions are disclosed. In one aspect, phase rotation sequences may be chosen in order to minimize a peak-to-average power ratio (PAPR) of a frame or data unit, or of a portion of a frame or data unit, where the frame contains a plurality of identical frequency segments, such as a duplicate frame. The method involves selecting a frame bandwidth, and then selecting a phase rotation sequence based upon the frame bandwidth. The method further includes generating a frame including a number of identical 1 MHz frequency segments, and rotating some of those segments relative to other segments, based on the selected phase rotation sequence. The method further includes transmitting the frame. | 06-05-2014 |
20140198741 | SYSTEM AND METHOD FOR SELECTING MEDIUM ACCESS PARAMETERS FOR EACH COMMUNICATION SESSION - Systems and methods for selecting medium access parameters for each communication session are disclosed. In one aspect an access point includes a processor configured to select a value for a medium access parameter for a particular communication session between the access point and a wireless station. | 07-17-2014 |
20140198872 | SYSTEMS AND METHODS FOR DETECTING OR SIGNALING THE PRESENCE OF BURSTY INTERFERENCE ON WIRELESS NETWORKS - Systems, methods, and devices for detecting and managing the presence of bursty interference on a wireless communication system are disclosed. One aspect of the subject matter described in the disclosure provides a method of detecting the presence of bursty interference on a wireless network. The method includes receiving, at a wireless device, a message from a transmitting device. The method further includes determining whether the message includes errors caused by bursty interference. The method further includes suspending a channel tracking when bursty interference is detected. In an embodiment the method further includes reporting bursty interference to the transmitting device when bursty interference is detected. | 07-17-2014 |
20140211704 | EXTENDING RANGE AND DELAY SPREAD IN WIFI BANDS - Certain aspects of the present disclosure relate to methods and apparatus for extending range and delay spread in 2.4 and 5 GHz bands, and potentially frequency multiplexing users. An apparatus is provided for wireless communications. The apparatus generally includes a processing system configured to generate a packet comprising a first preamble decodable by a first type of device and a second type of device, a second preamble that is decodable by the second type of device, but not the first type of device, and data and a transmitter configured to transmit the packet, wherein the first preamble is transmitted using a first channel bandwidth and the second preamble and data are transmitted using only a portion of the first channel bandwidth. | 07-31-2014 |
20140211775 | LARGER DELAY SPREAD SUPPORT FOR WIFI BANDS - Aspects of the present disclosure provide techniques that may help address the effects of larger delay spreads in WiFi bands. Methods and apparatus are provided that perform wireless communications utilizing varying cyclic prefix lengths, varying repetition intervals, and varying symbol durations to ameliorate the effects of large delay spreads. | 07-31-2014 |
20140247774 | MANAGING ACCESS TO TRANSMISSION MEDIUM IN A WIRELESS ENVIRONMENT - An apparatus and method for managing interference in a transmission medium are disclosed. A apparatus and method may be used to detect a condition experienced by only one of first and second wireless nodes, and modify an operational parameter of one of the first and second wireless nodes, if the condition is detected, such that both the first and second wireless nodes experience the condition or neither the first and second wireless nodes experience the condition. | 09-04-2014 |
20140269768 | METHODS AND APPARATUS FOR INCREASING DIVERSITY IN DOWNLINK TRANSMISSIONS - Certain aspects of the present disclosure provide methods and apparatus for obtaining second-order downlink spatial diversity within a wireless communication system in accordance with IEEE 802.11ah, for example. One example method generally includes generating a frame comprising a preamble having at least one field, replicating at least one bit of the at least one field to form a replica of the at least one bit, transmitting the at least one bit via a first antenna, and transmitting the replica of the at least one bit via a second antenna. Another example method generally includes generating at least two space-time streams; transmitting, via a first pair of antennas, the at least two space-time streams in a first frequency band; and transmitting, via a second pair of antennas, the at least two space-time streams in a second frequency band. | 09-18-2014 |
20140293905 | SYSTEM AND METHOD FOR CHANNEL-DEPENDENT CCA THRESHOLDS TO BALANCE DIFFERENT USE CASES IN WIRELESS NETWORKS - Systems and methods for channel-dependent CCA thresholds to balance different use cases in wireless networks are disclosed. In one aspect a device includes a receiver configured to receive transmissions on a plurality of channels. The device also includes a processor configured to determine whether a channel is one at least a first type or a second type of channel. If the channel is the first type, the processor is configured to determine whether the channel is available based at least in part on a set of first clear channel assessment thresholds. If the channel is the second type, the processor is configured to determine whether the channel is available based at least in part on a set of second clear channel assessment thresholds, where the set of second clear channel assessment thresholds is greater than or equal to the set of first clear channel assessment thresholds. | 10-02-2014 |
20140307612 | SYSTEMS AND METHODS FOR BACKWARDS-COMPATIBLE PREAMBLE FORMATS FOR MULTIPLE ACCESS WIRELESS COMMUNICATION - Systems, methods, and devices for wireless communication are disclosed herein. One aspect of the disclosure provides a method of transmitting to two or more wireless communication devices. The method includes transmitting a first section of a preamble according to a first format, the first section of the preamble containing information informing devices compatible with the first format to defer to the transmission, transmitting a second section of the preamble according to a second format, the second section of the preamble containing tone allocation information, the tone allocation information identifying two or more wireless communication devices; and transmitting data to the two or more wireless communication devices simultaneously, the data contained on two or more sub-bands. | 10-16-2014 |
20140307649 | SYSTEMS AND METHODS FOR BACKWARDS-COMPATIBLE PREAMBLE FORMATS FOR MULTIPLE ACCESS WIRELESS COMMUNICATION - Systems, methods, and devices for wireless communication are disclosed herein. One aspect of the disclosure provides a method of transmitting on a wireless communication network. The method includes transmitting to one or more first devices in a first portion of a bandwidth, the one or more first devices having a first set of capabilities, simultaneously transmitting to one or more second devices in a second portion of the bandwidth, the one or more second devices having a second set of capabilities, and wherein the transmission comprises a preamble which includes an indication for devices with the second set of capabilities to locate a frequency band in the bandwidth for symbols containing a set of transmission parameters for devices with the second set of capabilities, and where the indication is sent so as to have no substantial impact on a preamble decoding of devices with the first set of capabilities. | 10-16-2014 |
20140307650 | SYSTEMS AND METHODS FOR BACKWARDS-COMPATIBLE PREAMBLE FORMATS FOR MULTIPLE ACCESS WIRELESS COMMUNICATION - Systems, methods, and devices for wireless communication are disclosed herein. One aspect of the disclosure provides a method of receiving a transmission from two or more wireless communication devices. The method includes receiving a first preamble transmitted by a first wireless device; simultaneously receiving a second preamble transmitted by a second wireless device; receiving a first portion of the transmission in a first section of a bandwidth, the first portion transmitted by the first wireless device including a first data section; and simultaneously receiving a second portion of the transmission in a second section of the bandwidth, the second section of the bandwidth not overlapping with the first section of the bandwidth, the second portion transmitted by the second wireless device, the second portion including a second data section. | 10-16-2014 |
20140328191 | SYSTEMS AND METHODS FOR REUSE OF A WIRELESS MEDIUM FOR HIGH EFFICIENCY WIFI - Systems and method for concurrent communication using high efficiency wifi are disclosed. One aspect is a method of transmitting a wireless message on a medium utilizing carrier sense multiple access (CSMA). The method includes receiving, via a first wireless device, at least a portion of a first wireless message from a second wireless device, the message including an indication of a basic service set of the second wireless device. The method also includes determining whether to defer transmission of a second wireless message based, at least in part, on the basic service set of the second wireless device. | 11-06-2014 |
20140328192 | METHODS AND SYSTEMS FOR COMMUNICATION IN DENSE WIRELESS ENVIRONMENTS - Systems, methods, and computer readable storage media communicate with a wireless device within a dense wireless environment. In one aspect, a method includes determining whether a wireless device is subject to interference, adjusting a transmission attribute based on the determining, and transmitting a message to the wireless device based on the adjusted transmission attribute. In some aspects, adjusting a transmission attribute may include selecting one or more of time division multiplexing or frequency division multiplexing when communicating with the wireless device. In some aspects, particular time periods and/or particular frequency bands may be selected for communication with the device depending on whether the device is subject to interference. | 11-06-2014 |
20140328195 | SYSTEMS AND METHODS FOR DOWNLINK FREQUENCY DOMAIN MULTIPLEXING TRANSMISSIONS - Systems, methods, and devices for transmitting data are described herein. In some aspects, a method comprises generating a first packet. The first packet may comprise a physical layer and a media access control (MAC) layer. The MAC layer may allocate a first station to a primary frequency channel and a second station to a secondary frequency channel. The method further comprises transmitting the first packet to the first station and the second station. The method further comprises transmitting a second packet to the first station using the primary frequency channel. The method further comprises transmitting a third packet to the second station using the secondary frequency channel. | 11-06-2014 |
20140328235 | METHODS AND SYSTEMS FOR FREQUENCY MULTIPLEXED COMMUNICATION IN DENSE WIRELESS ENVIRONMENTS - Systems, methods, and devices for high-efficiency wireless frequency division multiplexing are provided. A method includes exchanging, at an access point, at least one frame reserving a wireless medium with at least one of a first and second wireless device. The method further includes receiving a first communication on a first set of wireless frequencies from the first wireless device. The method further includes receiving a second communication, at least partially concurrent with the first communication, on a second set of wireless frequencies from the second wireless device. The method further includes transmitting at least one acknowledgment of the first and second communication. The first set and the second set are mutually exclusive subsets of a set of wireless frequencies available for use by both the first and second wireless device. | 11-06-2014 |
20140328236 | METHODS AND SYSTEMS FOR FREQUENCY MULTIPLEXED COMMUNICATION IN DENSE WIRELESS ENVIRONMENTS - Systems, methods, and devices for high-efficiency wireless frequency division multiplexing are provided. A method includes receiving, at a first wireless device, a reference signal from an associated access point, the reference signal indicative of a time of joint transmission with at least a second wireless device. The method further includes transmitting a first communication to the access point based on the reference signal, the communication utilizing a first subset of wireless frequencies available for use. The first communication is concurrent with a second communication, from the second wireless device, utilizing a second subset of wireless frequencies, the second subset excluding the first subset. | 11-06-2014 |
20140328249 | SYSTEMS AND METHODS FOR AGGREGATION OF PHYSICAL PROTOCOL DATA UNITS ON A WIRELESS NETWORK - Systems and methods for aggregation of multiple physical protocol data units are disclosed. In one aspect, a method of transmitting a physical layer packet to a plurality of wireless devices is disclosed. The method includes generating a physical layer packet, the packet including a plurality of payloads, wherein at least one of the payloads comprises first data addressed to a first device and second data addressed to a second device, and wherein each payload is preceded by at least a signal field in the physical layer packet, and transmitting the physical layer packet. | 11-06-2014 |
20140328261 | SYSTEMS AND METHODS FOR PEER-TO-PEER AND AP TRAFFIC MULTIPLEXING - Systems, methods, and devices for concurrently allowing station-to-station transmissions and access point-to-station transmissions are described herein. In some aspects, a method comprises transmitting, to an access point, a request for an available channel frequency. The method further comprises receiving a coordination message from the access point. The coordination message may indicate that a first frequency channel is allocated for transmissions between a first device and a second device and that a second frequency channel is allocated for transmissions between a third device and a fourth device. The method further comprises transmitting a first data packet to the fourth device using the second frequency channel concurrently with a transmission of a second data packet between the first device and the second device using the first frequency channel. | 11-06-2014 |
20140328262 | SYSTEMS AND METHODS FOR PEER-TO-PEER AND AP TRAFFIC MULTIPLEXING - Systems, methods, and devices for concurrently allowing station-to-station transmissions and access point-to-station transmissions are described herein. In some aspects, a method comprises receiving, from a first device, a peer request to send message requesting a first time for transmissions with a second device. The method further comprises reserving the first time for transmissions between the first device and the second device. The method further comprises transmitting a coordination message to the first device and the second device. The coordination message may indicate that the first time is reserved for transmissions between the first device and the second device. The method further comprises transmitting a first data packet to a third device during a time other than the first time. The first device may transmit a second data packet to the second device during the first time. | 11-06-2014 |
20140328264 | SYSTEMS AND METHODS FOR COORDINATION MESSAGING USING HIGH EFFICIENCY WIFI - Systems, methods, and devices for coordinating access to a shared medium are described herein. In some aspects, a method includes receiving information at an access point. The method further includes modifying, based on the received information, the use of the shared medium by one or more wireless devices to reduce the likelihood that the wireless devices are subject to interference. The method may further include determining whether one or more wireless devices is subject to interference with another wireless device in the wireless network. The method may further include identifying the one or more wireless devices that is subject to interference. | 11-06-2014 |
20140328265 | SYSTEMS AND METHODS FOR DOWNLINK FREQUENCY DOMAIN MULTIPLEXING TRANSMISSIONS - Systems, methods, and devices for transmitting data are described herein. In some aspects, a method comprises generating a first message. The first message may comprise an allocation of a first station to a first frequency channel and a second station to a second frequency channel. The method further comprises transmitting the first message over the first frequency channel and the second frequency channel. The method further comprises transmitting, after transmission of the first message, a second message to the first station using the first frequency channel. The method further comprises transmitting, after transmission of the first message, a third message to the second station using the second frequency channel. | 11-06-2014 |
20140328313 | METHODS AND SYSTEMS FOR FREQUENCY MULTIPLEXED COMMUNICATION IN DENSE WIRELESS ENVIRONMENTS - Systems, methods, and devices for high-efficiency wireless frequency division multiplexing are provided. A method includes determining, at an access point, a performance characteristic for each wireless device in a set of wireless devices associated with the access point. The method further includes categorizing each wireless device in the set into at least a first and second subset of wireless devices based on the performance characteristic. The method further includes receiving communications from the first subset of wireless devices on a first set of wireless frequencies. The method further includes receiving communications from the second subset of wireless devices on a second set of wireless frequencies, the second set of wireless frequencies being a subset of the first. The first set of wireless devices have a higher performance characteristic than the second set of wireless devices. | 11-06-2014 |
20140355534 | METHODS AND APPARATUS FOR CLEAR CHANNEL ASSESSMENT - Systems and methods for determining primary channel availability are disclosed. One aspect is a method in a wireless communications system including a first primary channel having first and second frequency spectrum bandwidths. The second frequency spectrum bandwidth includes the first frequency spectrum bandwidth. The method includes determining whether a first preamble has been detected on the second primary channel during a first threshold period of time, determining whether a second preamble has been detected on the first primary channel during a second threshold period of time, determining whether a guard interval has been detected on the second primary channel during a third threshold period of time, determining whether the second primary channel is idle based at least in part on detection of the first preamble, the second preamble and the guard interval, and transmitting a wireless message based at least in part on whether the second primary channel is idle. | 12-04-2014 |
20140355556 | METHODS AND APPARATUS FOR CLEAR CHANNEL ASSESSMENT - One aspect disclosed is a method in a wireless communications system including a first primary channel having a first frequency spectrum bandwidth and a second primary channel having a second frequency spectrum bandwidth, wherein the second frequency spectrum bandwidth includes the first frequency spectrum bandwidth. The method includes performing a first and a second back-off procedure at least partially in parallel, the first back-off procedure based on whether the first primary channel is idle, and the second back-off procedure based on whether the second primary channel is idle, and transmitting a wireless message based on whether the first or the second back-off procedure completes first. | 12-04-2014 |
20140369263 | DUAL INTERPRETATION OF A LENGTH FIELD OF A SIGNAL UNIT - A method includes receiving, at a wireless device, a frame via a sub-1 gigahertz (GHz) wireless network. The frame includes a signal (SIG) unit including a length field and an aggregation field. The length field may be interpreted as a number of bytes or as a number of symbols based on a value of the aggregation field and based on whether the frame is associated with a 1 megahertz (MHz) bandwidth mode, based on whether the frame includes either a short format preamble or a long format preamble, or based on whether the frame is determined to be a single user (SU) frame or a multi user (MU) frame. | 12-18-2014 |
20140369302 | SYSTEMS AND METHODS FOR COMMUNICATION OF CHANNEL STATE INFORMATION - Certain aspects of the present disclosure relate to a technique for communicating Channel State Information (CSI) feedback. In some aspects, the CSI feedback is communicated in a very high throughput (VHT) wireless communications system. | 12-18-2014 |
20150023288 | DUAL INTERPRETATION OF A LENGTH FIELD OF A SIGNAL UNIT - A method includes generating, at a second wireless device, a signal (SIG) unit to be transmitted to a first wireless device. The SIG unit includes a length field and an aggregation field. In response to determining to use aggregated transmission to the first wireless device, the method further includes setting the aggregation field to a first value and setting the length field to a number of symbols. In response to determining not to use the aggregated transmission to the first wireless device, the method further includes setting the aggregation field to a second value and setting the length field to a number of bytes. | 01-22-2015 |
20150023335 | PHYSICAL LAYER DESIGN FOR UPLINK (UL) MULTIUSER MULTIPLE-INPUT, MULTIPLE-OUTPUT (MU-MIMO) IN WIRELESS LOCAL AREA NETWORK (WLAN) SYSTEMS - Certain aspects of the present disclosure provide methods and apparatus for uplink (UL) multiuser multiple-input, multiple-output (MU-MIMO) transmissions in a High Efficiency WLAN (HEW) system. One example method generally includes generating a packet having a preamble portion and transmitting the packet. The preamble portion typically includes a long training field (LTF); a first signal (SIG) field subsequent to the LTF; one or more other LTFs located subsequent to the first SIG field; and at least one second SIG field, wherein all SIG fields in the preamble portion, other than the first SIG field, are subsequent to the one or more other LTFs. Another example method generally includes receiving, from an apparatus, a packet having a preamble portion comprising tone-interleaved LTFs; and performing frequency offset adjustment on the packet based on the tone-interleaved LTFs. | 01-22-2015 |
20150055587 | SYSTEMS, METHODS, AND APPARATUS FOR INCREASING REUSE IN WIRELESS COMMUNICATIONS - Systems, methods, and apparatus are disclosed for increasing reuse in wireless communications. In one aspect, a method of wireless communication is provided, transmitting a message to a first station indicating an identified transmission opportunity for the first station to communicate with a second station. The method further comprises transmitting a first wireless communication signal to at least a third station utilizing beamformed wireless communication such that the first wireless communication signal to the third station has a received signal level below a threshold at one or both of the first and second stations. The identified transmission opportunity is based on whether a transmission of a second wireless communication signal between the first and the second stations occurs over a period of time that is at least partially concurrent with the utilized beamformed communication. | 02-26-2015 |
20150063111 | METHODS AND APPARATUS FOR MULTIPLE USER UPLINK - Methods and apparatus for multiple user uplink are provided. In one aspect, a method of wireless communication is provided. The method includes transmitting a quality of service (QoS) message to a device. The QoS message includes a request for a transmission opportunity for sending uplink data to the device. The QoS message includes at least one of a sequence control field or a QoS control field. The method further includes receiving a clear to transmit (CTX) message in response to the QoS message. The method further includes transmitting data to the device in response to the CTX message. | 03-05-2015 |
20150063190 | METHODS AND APPARATUS FOR MULTIPLE USER UPLINK - Methods and apparatus for multiple user uplink are provided. In one aspect, a method of wireless communication is provided. The method includes transmitting a first message to at least two stations. The first message indicates a second message to be transmitted to at least two stations after the first message. The method further includes transmitting the second message to the at least two stations. The method further includes receiving a plurality of uplink data from the at least two stations in response to the second message. | 03-05-2015 |
20150063191 | METHODS AND APPARATUS FOR MULTIPLE USER UPLINK - Methods and apparatus for multiple user uplink are provided. In one aspect, a method for wireless communication is provided. The method includes transmitting a clear to transmit (CTX) message to two or more stations, the CTX indicating an uplink transmission opportunity, the CTX message further comprising a request that the two or more stations concurrently transmit uplink data at a specific time. The method further includes receiving a plurality of uplink data from at least two stations at the specific time. | 03-05-2015 |
20150063255 | TONE ALLOCATION FOR MULTIPLE ACCESS WIRELESS NETWORKS - A method includes generating a data packet at an access point. The data packet is to be communicated using a waveform that includes a first set of tones that is allocated to a first destination device and a second set of tones that is allocated to a second destination device. The first set of tones is non-overlapping with respect to the second set of tones, and each tone of the first set of tones and each tone of the second set of tones is an orthogonal frequency-division multiple access (OFDMA) tone. The method also includes transmitting the data packet to the first destination device via an institute of electrical and electronics engineers (IEEE) 802.11 wireless network and transmitting the data packet to the second destination device via the IEEE 802.11 wireless network. | 03-05-2015 |
20150063257 | METHODS AND APPARATUS FOR MULTIPLE USER UPLINK - Methods and apparatus for multiple user uplink are provided. In one aspect, a method of wireless communication is provided. The method includes transmitting a scheduling message to one or more stations. The scheduling message requests the one or more stations to transmit a station information message in response to the scheduling message. The method further includes receiving a plurality of station information messages. The station information messages indicates station information. The method further includes transmitting a media access control multi user (MAC MU) scheduling message to two or more stations. The MAC MU scheduling message is included in a payload portion of a physical layer data unit (PPDU) and indicates an uplink transmission opportunity and requests the two or more stations to concurrently transmit uplink data at a specific time. | 03-05-2015 |
20150063258 | METHODS AND APPARATUS FOR MULTIPLE USER UPLINK - A method for wireless communication is provided. The method comprises transmitting a first wireless message comprising a request for a first user terminal to transmit uplink data and an indication of at least one requested operational parameter. The method also comprises receiving a second wireless message from an access point in response to the first wireless message, the second wireless message indicating whether a plurality of user terminals including the first user terminal is selected to transmit uplink data, the second wireless message indicating at least one operational parameter for transmission of uplink data based on the at least one requested operational parameter. | 03-05-2015 |
20150063291 | METHODS AND APPARATUS FOR MULTI-USER UPLINK - Methods and apparatus for multiple user uplink are provided. In one aspect, a method for wireless communication includes generating a first wireless message granting permission for a first station to transmit during a transmission opportunity, generating a second wireless message granting permission for a second station to transmit during the transmission opportunity; and transmitting the first wireless message to the first station at least partially concurrently with transmission of the second wireless message to the second station. | 03-05-2015 |
20150063318 | METHODS AND APPARATUS FOR MULTIPLE USER UPLINK - The disclosure provides methods and apparatuses for multiple user uplink. One aspect of the disclosure provides a method for wireless communication. The method comprises receiving a first wireless message from an access point indicating an uplink transmission opportunity and a target transmission duration for each of a plurality of user terminals including a first user terminal. The method also comprises changing a planned transmission duration of a second wireless message from the first user terminal to fit the target transmission duration. The method also comprises transmitting the second wireless message from the first user terminal over the target transmission duration. | 03-05-2015 |
20150063320 | METHODS AND APPARATUS FOR ACKNOWLEDGMENT OF MULTI-USER UPLINK WIRELESS TRANSMISSIONS - Methods and apparatus for acknowledgment of multiple user uplink are provided. In one aspect, a method of wireless communication includes receiving a first wireless message from a first station at least partially concurrently with receiving a second wireless message from a second station, generating a first acknowledgment message in response to receiving the first wireless message, generating a second acknowledgement message in response to receiving the second wireless message, and transmitting the first acknowledgment message to the first station at least partially concurrently with transmitting the second acknowledgement message to the second station. | 03-05-2015 |
20150063334 | LOW RATE DATA COMMUNICATION - A method includes generating a data packet at a source device for transmission via an Institute of Electrical and Electronics Engineers 802.11 wireless network. The data packet includes multiple data symbols that are duplicated in the data packet. At least a portion of a preamble of the data packet is not duplicated in the data packet. The portion of the preamble indicates that the packet is a low rate mode packet. The method also includes transmitting the data packet from the source device to a destination device via the wireless network. | 03-05-2015 |
20150071215 | MIDPACKET DETECTION SCHEMES FOR CLEAR CHANNEL ASSESSMENT (CCA) - Certain aspects of the present disclosure provide methods and apparatus for detecting ongoing transmissions and assessing channel state, based on midpacket detection. One example method generally includes receiving signals on a primary channel; detecting, based on the received signals, occurrence or non-occurrence of a first ongoing packet transmission on a primary channel; and generating at least one of a busy signal or an idle signal based on the detection. In this manner, collisions may be avoided. | 03-12-2015 |
20150071272 | MULTI-USER MULTIPLE-INPUT MULTIPLE-OUTPUT (MU-MIMO) FEEDBACK PROTOCOL - In a wireless network having a plurality of devices configured to communicate using a beamforming technique, a method includes sending a trigger packet from a first device of the wireless network to a plurality of second devices of the wireless network. The trigger packet includes trigger data configured to cause the plurality of second devices to perform channel measurement based on the trigger data. The method also includes receiving feedback information from each of the plurality of second devices in response to the trigger packet. | 03-12-2015 |
20150078368 | ENHANCEMENTS TO THE MU-MIMO VHT PREAMBLE TO ENABLE MODE DETECTION - Certain aspects of the present disclosure present a technique for enabling a receiver to detect mode of transmission of a signal based on a common field transmitted to all the receivers. The proposed technique includes frame structure in which information about the transmission mode is transmitted in a first portion of a SIG field to all the receivers. | 03-19-2015 |
20150085653 | METHOD AND APPARATUS FOR SUPPORTING MODULATION-CODING SCHEME SET IN VERY HIGH THROUGHPUT WIRELESS SYSTEMS - Certain aspects of the present disclosure relate to techniques for designing Modulation-Coding Scheme (MSC) set fields in a transmission frame of Very High Throughput (VHT) wireless systems. | 03-26-2015 |